Efficacy of Removing Bacteria and Organic Dirt from Hands—A Study Based on Bioluminescence Measurements for Evaluation of Hand Hygiene When Cooking

The objective of this study was to evaluate the efficacy of dirt removal (bacteria and organic matter) of several hand-cleaning procedures. The results from the hand hygiene experiment indicated that washing hands with warm water and soap for 20 s is the most effective method investigated when hands are either dirty or greasy. Even if not proper washing, rinsing under running water for 5 s is a cleaning procedure that may significantly reduce the probability of cross-contamination, as it removes 90% of the hands’ dirt. Although less effective than water and soap, the usage of antibacterial wipes was significantly more effective than wet wipes, indicating that they are a better choice when water and soap are not available. The results of this study enable us to inform consumers about the effectiveness of hand-cleaning procedures applied in their homes when cooking. Moreover, it can make consumers understand why, during the COVID-19 pandemic, authorities recommended washing hands as a preventive measure of infection and using an anti-bacterial hand gel or wiping hands with an antimicrobial wipe if water and soap are not available.

Easy-to-Make Polymer Hydrogels by UV-Curing for the Cleaning of Acrylic Emulsion Paint Films

The cleaning of acrylic emulsion paint surfaces poses a great challenge in the conservation field, due to their high water sensitivity. In this article, we present easy-to-make polymer hydrogels, made by UV-photopolymerization, that show excellent cleaning properties. The formulation of hydrogels obtained by UV-curing and their performance as dry cleaners for acrylic paints was investigated. First, different hydrogel formulations based on functional acrylic monomers were used to formulate a series of UV cross-linked hydrogels by fast UV photopolymerization. Their effectiveness on surface dirt removal was investigated by SEM microscopy and colorimetry. The hydrogels showed excellent cleaning properties and controlled water release, and they still performed satisfactorily after several cleaning uses. The obtained UV-hydrogels were compared to the well-known agar gels, showing benefits in terms of reducing excess water. This article shows that easy-to-make UV-cured hydrogels are an efficient tool for the cleaning of surface dirt from water-sensitive paintings, overcoming the limits of traditional cleaning methods.

Self-Ear Cleaning Practices and the Associated Risks: A Systematic Review

BACKGROUND: Naturally the ear produces soft wax from the sebaceous and ceruminous gland. This is what is referred to as earwax. This wax is important for protection of the ear by trapping dust and other foreign particles that could damage the eardrum. It also has some antibacterial properties. Jaw movements, like during chewing, moves the old earwax from inside the ear canal to the outside and finally flakes off. Build-up of this wax in the ear causes hearing loss, pain in the ear, irritation, dizziness and ringing in the ears. Self-ear cleaning refers to self-insertion of objects into the ear canal, with an attempt to remove the wax to get rid of these symptoms. It is a common practice amongst many individuals. Potentially, this rids the ear of its protective defences in addition to posing a risk of ear related injuries. This review paper aims to determine the prevalence of self-ear cleaning, the common methods used and the complications associated with this practice. METHODS: Electronic retrieval of articles for review was done from PubMed, Google and Google scholar with key-ward – self-ear cleaning, ear-wax, cerumen. Many articles were retrieved but only a few were about self-ear cleaning and only seven could be included in this review. The inclusion criteria included: article published in English language; study carried between 2005 and 2020 inclusive; article discussing materials used and complications associated with self-ear cleaning. Articles older than 15 years or published in languages other than English were excluded. RESULTS: On average the prevalence of self-ear cleaning amongst all studies was 76.6%. The commonest method used for ear cleaning was cotton buds with an average of 69.6%. Wax/dirt removal was the commonest reason for engaging in this practice. Several complications arising from this practice included perforation of eardrum, retained foreign body and otitis externa. CONCLUSION: In addition to ridding the ear of its natural protection, self-ear cleaning is associated with a risk of injury to the ear drum and retention of foreign bodies. Community education to avoid this practice is therefore of paramount importance. Trained health care providers should be consulted whenever someone has a problem related to hearing or any other symptoms.

Superhydrophobic Surface with Gamma Irradiation Resistance and Self-Cleaning Effect in Air and Oil

A superhydrophobic surface was synthesized by a combination of an epoxy/polymethylphenylsiloxane matrix and dual-scale morphology of silica (SiO2) nanoparticles. When the amount of SiO2 reached 30 wt.%, the as-prepared surface showed a high static water contact angle (WCA) of 154° and a low sliding angle (SA) of 5°, excellent water repellency, and dirt-removal effects both in air and oil (hexamethylene). Even after exposure to as high as a 12.30 Mrad dose of gamma-rays, the composite surface still maintained its superior performance.

Opportunities regarding the potential use of the self-cleaning concept within urban contemporary architecture in Romania

Contemporary urban architecture faces two important issues: degradation of buildings, caused by exposure to various environmental factors (air and water pollution, mainly generated by the fuels combustion used for transport and heating) and also the costs for repair, cleaning and maintenance of the buildings facades. Regarding the last mentioned aspects, recent research led to development of materials with self-cleaning potential and consequently pollution reduction. Self-cleaning concrete represents a state-of-the-art material with photocatalytic properties generated by the addition in its composition of nanomaterials like TiO2. Already known for its intrinsic photocatalytic character, TiO2 has the ability to catalyse the decomposition of organic substances like grease and dirt, facilitating their quick removal only by rainwater action. Therefore, a building façade made of TiO2-SiO2-containing material develops substantial savings regarding maintenance costs, water consumption and less detergents contamination due to its intrinsic super hydrophilic effect of the surface in the presence of UV radiation, leading to easy dirt removal when water reaches it. The aim of present paper is presenting the latest stage of worldwide research regarding the obtaining of self-cleaning concrete and also the possibility of adapting the concept to the actual Romanian architecture needs, as a sustainable solution for urban pollution reduction.

Improved deinking and stickies removal

Previous work had shown that a novel flotation deinking reagent using modified kaolin was able to more efficiently separate and remove ink and dirt particles from recovered paper. The mechanism for this reagent is based on the ability of the modified kaolin to act as a collector for the fine ink, dirt, and contaminant particles. Deinking mills using this reagent experienced deinked pulp with an increase in brightness and lower dirt count values. Further work has been carried out to determine whether this mechanism can be used to improve the removal of stickies in recovered pulp. Test results showed that use of this modified kaolin together with a reagent capable of effectively separating the sticky contaminants from the fiber improved the removal of stickies. The synergy of this reagent with the modified kaolin further improved ink and dirt removal.

The Research on Remanufacturing Cleaning Machenism

Remanufactured parts need to be cleaned before testing and repairing.Molten salt cleaning become a new research focus in remanufacturing cleaning. This paper analyze and research the dirt removal mechanism. This paper analyzes the effect of different salt bath cleaning time and temperature, from the action of heat, comprising a plurality of aspects of surface tension, expansion coefficient and chemical analysis of the role removal mechanism. cleaning effect is researched controlling different conditions in experiments according to the removal mechanism. Experimental results show that the cleaning effect is more obvious, cleaning a relatively short time, ready to meet the requirements of remanufacturing blanks.